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  <div class="section" id="java-s3-examples">
<span id="java"></span><h1>Java S3 Examples<a class="headerlink" href="#java-s3-examples" title="Permalink to this headline">¶</a></h1>
<div class="section" id="setup">
<h2>Setup<a class="headerlink" href="#setup" title="Permalink to this headline">¶</a></h2>
<p>The following examples may require some or all of the following java
classes to be imported:</p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">java.io.ByteArrayInputStream</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">java.io.File</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">java.util.List</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.auth.AWSCredentials</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.auth.BasicAWSCredentials</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.util.StringUtils</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.services.s3.AmazonS3</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.services.s3.AmazonS3Client</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.services.s3.model.Bucket</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.services.s3.model.CannedAccessControlList</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.services.s3.model.GeneratePresignedUrlRequest</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.services.s3.model.GetObjectRequest</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.services.s3.model.ObjectListing</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.services.s3.model.ObjectMetadata</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.services.s3.model.S3ObjectSummary</span><span class="p">;</span>
</pre></div>
</div>
<p>If you are just testing the Ceph Object Storage services, consider
using HTTP protocol instead of HTTPS protocol.</p>
<p>First, import the <code class="docutils literal notranslate"><span class="pre">ClientConfiguration</span></code> and <code class="docutils literal notranslate"><span class="pre">Protocol</span></code> classes.</p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">com.amazonaws.ClientConfiguration</span><span class="p">;</span>
<span class="kn">import</span> <span class="nn">com.amazonaws.Protocol</span><span class="p">;</span>
</pre></div>
</div>
<p>Then, define the client configuration, and add the client configuration
as an argument for the S3 client.</p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">AWSCredentials</span> <span class="n">credentials</span> <span class="o">=</span> <span class="k">new</span> <span class="n">BasicAWSCredentials</span><span class="p">(</span><span class="n">accessKey</span><span class="p">,</span> <span class="n">secretKey</span><span class="p">);</span>

<span class="n">ClientConfiguration</span> <span class="n">clientConfig</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ClientConfiguration</span><span class="p">();</span>
<span class="n">clientConfig</span><span class="p">.</span><span class="na">setProtocol</span><span class="p">(</span><span class="n">Protocol</span><span class="p">.</span><span class="na">HTTP</span><span class="p">);</span>

<span class="n">AmazonS3</span> <span class="n">conn</span> <span class="o">=</span> <span class="k">new</span> <span class="n">AmazonS3Client</span><span class="p">(</span><span class="n">credentials</span><span class="p">,</span> <span class="n">clientConfig</span><span class="p">);</span>
<span class="n">conn</span><span class="p">.</span><span class="na">setEndpoint</span><span class="p">(</span><span class="s">&quot;endpoint.com&quot;</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="creating-a-connection">
<h2>Creating a Connection<a class="headerlink" href="#creating-a-connection" title="Permalink to this headline">¶</a></h2>
<p>This creates a connection so that you can interact with the server.</p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">String</span> <span class="n">accessKey</span> <span class="o">=</span> <span class="s">&quot;insert your access key here!&quot;</span><span class="p">;</span>
<span class="n">String</span> <span class="n">secretKey</span> <span class="o">=</span> <span class="s">&quot;insert your secret key here!&quot;</span><span class="p">;</span>

<span class="n">AWSCredentials</span> <span class="n">credentials</span> <span class="o">=</span> <span class="k">new</span> <span class="n">BasicAWSCredentials</span><span class="p">(</span><span class="n">accessKey</span><span class="p">,</span> <span class="n">secretKey</span><span class="p">);</span>
<span class="n">AmazonS3</span> <span class="n">conn</span> <span class="o">=</span> <span class="k">new</span> <span class="n">AmazonS3Client</span><span class="p">(</span><span class="n">credentials</span><span class="p">);</span>
<span class="n">conn</span><span class="p">.</span><span class="na">setEndpoint</span><span class="p">(</span><span class="s">&quot;objects.dreamhost.com&quot;</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="listing-owned-buckets">
<h2>Listing Owned Buckets<a class="headerlink" href="#listing-owned-buckets" title="Permalink to this headline">¶</a></h2>
<p>This gets a list of Buckets that you own.
This also prints out the bucket name and creation date of each bucket.</p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">List</span><span class="o">&lt;</span><span class="n">Bucket</span><span class="o">&gt;</span> <span class="n">buckets</span> <span class="o">=</span> <span class="n">conn</span><span class="p">.</span><span class="na">listBuckets</span><span class="p">();</span>
<span class="k">for</span> <span class="p">(</span><span class="n">Bucket</span> <span class="n">bucket</span> <span class="p">:</span> <span class="n">buckets</span><span class="p">)</span> <span class="p">{</span>
        <span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">println</span><span class="p">(</span><span class="n">bucket</span><span class="p">.</span><span class="na">getName</span><span class="p">()</span> <span class="o">+</span> <span class="s">&quot;\t&quot;</span> <span class="o">+</span>
                <span class="n">StringUtils</span><span class="p">.</span><span class="na">fromDate</span><span class="p">(</span><span class="n">bucket</span><span class="p">.</span><span class="na">getCreationDate</span><span class="p">()));</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The output will look something like this:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">mahbuckat1</span>   <span class="mi">2011</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">21</span><span class="n">T18</span><span class="p">:</span><span class="mi">05</span><span class="p">:</span><span class="mf">39.000</span><span class="n">Z</span>
<span class="n">mahbuckat2</span>   <span class="mi">2011</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">21</span><span class="n">T18</span><span class="p">:</span><span class="mi">05</span><span class="p">:</span><span class="mf">48.000</span><span class="n">Z</span>
<span class="n">mahbuckat3</span>   <span class="mi">2011</span><span class="o">-</span><span class="mi">04</span><span class="o">-</span><span class="mi">21</span><span class="n">T18</span><span class="p">:</span><span class="mi">07</span><span class="p">:</span><span class="mf">18.000</span><span class="n">Z</span>
</pre></div>
</div>
</div>
<div class="section" id="creating-a-bucket">
<h2>Creating a Bucket<a class="headerlink" href="#creating-a-bucket" title="Permalink to this headline">¶</a></h2>
<p>This creates a new bucket called <code class="docutils literal notranslate"><span class="pre">my-new-bucket</span></code></p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">Bucket</span> <span class="n">bucket</span> <span class="o">=</span> <span class="n">conn</span><span class="p">.</span><span class="na">createBucket</span><span class="p">(</span><span class="s">&quot;my-new-bucket&quot;</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="listing-a-bucket-s-content">
<h2>Listing a Bucket’s Content<a class="headerlink" href="#listing-a-bucket-s-content" title="Permalink to this headline">¶</a></h2>
<p>This gets a list of objects in the bucket.
This also prints out each object’s name, the file size, and last
modified date.</p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">ObjectListing</span> <span class="n">objects</span> <span class="o">=</span> <span class="n">conn</span><span class="p">.</span><span class="na">listObjects</span><span class="p">(</span><span class="n">bucket</span><span class="p">.</span><span class="na">getName</span><span class="p">());</span>
<span class="k">do</span> <span class="p">{</span>
        <span class="k">for</span> <span class="p">(</span><span class="n">S3ObjectSummary</span> <span class="n">objectSummary</span> <span class="p">:</span> <span class="n">objects</span><span class="p">.</span><span class="na">getObjectSummaries</span><span class="p">())</span> <span class="p">{</span>
                <span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">println</span><span class="p">(</span><span class="n">objectSummary</span><span class="p">.</span><span class="na">getKey</span><span class="p">()</span> <span class="o">+</span> <span class="s">&quot;\t&quot;</span> <span class="o">+</span>
                        <span class="n">objectSummary</span><span class="p">.</span><span class="na">getSize</span><span class="p">()</span> <span class="o">+</span> <span class="s">&quot;\t&quot;</span> <span class="o">+</span>
                        <span class="n">StringUtils</span><span class="p">.</span><span class="na">fromDate</span><span class="p">(</span><span class="n">objectSummary</span><span class="p">.</span><span class="na">getLastModified</span><span class="p">()));</span>
        <span class="p">}</span>
        <span class="n">objects</span> <span class="o">=</span> <span class="n">conn</span><span class="p">.</span><span class="na">listNextBatchOfObjects</span><span class="p">(</span><span class="n">objects</span><span class="p">);</span>
<span class="p">}</span> <span class="k">while</span> <span class="p">(</span><span class="n">objects</span><span class="p">.</span><span class="na">isTruncated</span><span class="p">());</span>
</pre></div>
</div>
<p>The output will look something like this:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">myphoto1</span><span class="o">.</span><span class="n">jpg</span> <span class="mi">251262</span>  <span class="mi">2011</span><span class="o">-</span><span class="mi">08</span><span class="o">-</span><span class="mi">08</span><span class="n">T21</span><span class="p">:</span><span class="mi">35</span><span class="p">:</span><span class="mf">48.000</span><span class="n">Z</span>
<span class="n">myphoto2</span><span class="o">.</span><span class="n">jpg</span> <span class="mi">262518</span>  <span class="mi">2011</span><span class="o">-</span><span class="mi">08</span><span class="o">-</span><span class="mi">08</span><span class="n">T21</span><span class="p">:</span><span class="mi">38</span><span class="p">:</span><span class="mf">01.000</span><span class="n">Z</span>
</pre></div>
</div>
</div>
<div class="section" id="deleting-a-bucket">
<h2>Deleting a Bucket<a class="headerlink" href="#deleting-a-bucket" title="Permalink to this headline">¶</a></h2>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The Bucket must be empty! Otherwise it won’t work!</p>
</div>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">conn</span><span class="p">.</span><span class="na">deleteBucket</span><span class="p">(</span><span class="n">bucket</span><span class="p">.</span><span class="na">getName</span><span class="p">());</span>
</pre></div>
</div>
</div>
<div class="section" id="forced-delete-for-non-empty-buckets">
<h2>Forced Delete for Non-empty Buckets<a class="headerlink" href="#forced-delete-for-non-empty-buckets" title="Permalink to this headline">¶</a></h2>
<div class="admonition attention">
<p class="admonition-title">Attention</p>
<p>not available</p>
</div>
</div>
<div class="section" id="creating-an-object">
<h2>Creating an Object<a class="headerlink" href="#creating-an-object" title="Permalink to this headline">¶</a></h2>
<p>This creates a file <code class="docutils literal notranslate"><span class="pre">hello.txt</span></code> with the string <code class="docutils literal notranslate"><span class="pre">&quot;Hello</span> <span class="pre">World!&quot;</span></code></p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">ByteArrayInputStream</span> <span class="n">input</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ByteArrayInputStream</span><span class="p">(</span><span class="s">&quot;Hello World!&quot;</span><span class="p">.</span><span class="na">getBytes</span><span class="p">());</span>
<span class="n">conn</span><span class="p">.</span><span class="na">putObject</span><span class="p">(</span><span class="n">bucket</span><span class="p">.</span><span class="na">getName</span><span class="p">(),</span> <span class="s">&quot;hello.txt&quot;</span><span class="p">,</span> <span class="n">input</span><span class="p">,</span> <span class="k">new</span> <span class="n">ObjectMetadata</span><span class="p">());</span>
</pre></div>
</div>
</div>
<div class="section" id="change-an-object-s-acl">
<h2>Change an Object’s ACL<a class="headerlink" href="#change-an-object-s-acl" title="Permalink to this headline">¶</a></h2>
<p>This makes the object <code class="docutils literal notranslate"><span class="pre">hello.txt</span></code> to be publicly readable, and
<code class="docutils literal notranslate"><span class="pre">secret_plans.txt</span></code> to be private.</p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">conn</span><span class="p">.</span><span class="na">setObjectAcl</span><span class="p">(</span><span class="n">bucket</span><span class="p">.</span><span class="na">getName</span><span class="p">(),</span> <span class="s">&quot;hello.txt&quot;</span><span class="p">,</span> <span class="n">CannedAccessControlList</span><span class="p">.</span><span class="na">PublicRead</span><span class="p">);</span>
<span class="n">conn</span><span class="p">.</span><span class="na">setObjectAcl</span><span class="p">(</span><span class="n">bucket</span><span class="p">.</span><span class="na">getName</span><span class="p">(),</span> <span class="s">&quot;secret_plans.txt&quot;</span><span class="p">,</span> <span class="n">CannedAccessControlList</span><span class="p">.</span><span class="na">Private</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="download-an-object-to-a-file">
<h2>Download an Object (to a file)<a class="headerlink" href="#download-an-object-to-a-file" title="Permalink to this headline">¶</a></h2>
<p>This downloads the object <code class="docutils literal notranslate"><span class="pre">perl_poetry.pdf</span></code> and saves it in
<code class="docutils literal notranslate"><span class="pre">/home/larry/documents</span></code></p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">conn</span><span class="p">.</span><span class="na">getObject</span><span class="p">(</span>
        <span class="k">new</span> <span class="n">GetObjectRequest</span><span class="p">(</span><span class="n">bucket</span><span class="p">.</span><span class="na">getName</span><span class="p">(),</span> <span class="s">&quot;perl_poetry.pdf&quot;</span><span class="p">),</span>
        <span class="k">new</span> <span class="n">File</span><span class="p">(</span><span class="s">&quot;/home/larry/documents/perl_poetry.pdf&quot;</span><span class="p">)</span>
<span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="delete-an-object">
<h2>Delete an Object<a class="headerlink" href="#delete-an-object" title="Permalink to this headline">¶</a></h2>
<p>This deletes the object <code class="docutils literal notranslate"><span class="pre">goodbye.txt</span></code></p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">conn</span><span class="p">.</span><span class="na">deleteObject</span><span class="p">(</span><span class="n">bucket</span><span class="p">.</span><span class="na">getName</span><span class="p">(),</span> <span class="s">&quot;goodbye.txt&quot;</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="generate-object-download-urls-signed-and-unsigned">
<h2>Generate Object Download URLs (signed and unsigned)<a class="headerlink" href="#generate-object-download-urls-signed-and-unsigned" title="Permalink to this headline">¶</a></h2>
<p>This generates an unsigned download URL for <code class="docutils literal notranslate"><span class="pre">hello.txt</span></code>. This works
because we made <code class="docutils literal notranslate"><span class="pre">hello.txt</span></code> public by setting the ACL above.
This then generates a signed download URL for <code class="docutils literal notranslate"><span class="pre">secret_plans.txt</span></code> that
will work for 1 hour. Signed download URLs will work for the time
period even if the object is private (when the time period is up, the
URL will stop working).</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The java library does not have a method for generating unsigned
URLs, so the example below just generates a signed URL.</p>
</div>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">GeneratePresignedUrlRequest</span> <span class="n">request</span> <span class="o">=</span> <span class="k">new</span> <span class="n">GeneratePresignedUrlRequest</span><span class="p">(</span><span class="n">bucket</span><span class="p">.</span><span class="na">getName</span><span class="p">(),</span> <span class="s">&quot;secret_plans.txt&quot;</span><span class="p">);</span>
<span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">println</span><span class="p">(</span><span class="n">conn</span><span class="p">.</span><span class="na">generatePresignedUrl</span><span class="p">(</span><span class="n">request</span><span class="p">));</span>
</pre></div>
</div>
<p>The output will look something like this:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>https://my-bucket-name.objects.dreamhost.com/secret_plans.txt?Signature=XXXXXXXXXXXXXXXXXXXXXXXXXXX&amp;Expires=1316027075&amp;AWSAccessKeyId=XXXXXXXXXXXXXXXXXXX
</pre></div>
</div>
</div>
</div>



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